Charge partitioning and anomalous hole doping in Rh-doped Sr2IrO4

Chikara, Shalinee; Fabbris, G.; Terzic, J.; Cao, G.; Khomskii, D.; Haskel, D.

doi:10.1103/PhysRevB.95.060407

Charge partitioning and anomalous hole doping in Rh-doped ${Sr}_{2} {IrO}_{4}$

Journal Article · Wed Feb 15 04:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.95.060407· OSTI ID:1345729

Chikara, Shalinee ^[1]; Fabbris, G. ^[2]; Terzic, J. ^[3]; Cao, G. ^[3]; Khomskii, D. ^[4]; Haskel, D. ^[5]

Argonne National Lab. (ANL), Argonne, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Washington Univ., St. Louis, MO (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. zu Koln, Koln (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)

The simultaneous presence of sizable spin-orbit interactions and electron correlations in iridium oxides has led to predictions of novel ground states including Dirac semimetals, Kitaev spin liquids, and superconductivity. Electron and hole doping studies of spin-orbit assisted Mott insulator Sr₂IrO₄ are being intensively pursued due to extensive parallels with the La₂CuO₄ parent compound of cuprate superconductors. In particular, the mechanism of charge doping associated with replacement of Ir with Rh ions remains controversial with profound consequences for the interpretation of electronic structure and transport data. Using x-ray absorption near edge structure measurements at the Rh L, K, and Ir L edges we observe anomalous evolution of charge partitioning between Rh and Ir with Rh doping. The partitioning of charge between Rh and Ir sites progresses in a way that holes are initially doped into the J_eff = 1/2 band at low x only to be removed from it at higher x values. Furthermore, this anomalous hole doping naturally explains the reentrant insulating phase in the phase diagram of Sr₂Ir_1–xRh_xO₄ and ought to be considered when searching for superconductivity and other emergent phenomena in iridates doped with 4d elements.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1345729

Alternate ID(s):: OSTI ID: 1344005
OSTI ID: 1431080
OSTI ID: 1390814

Report Number(s):: BNL--113512-2017-JA; KC0201060

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 95; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (6)

Preferential quenching of 5 d antiferromagnetic order in Sr ₃ (Ir _{1− x} Mn _x ) ₂ O ₇ Schmehr, Julian L.; Zoghlin, Eli; Porter, Zach Journal of Physics: Condensed Matter, Vol. 31, Issue 24 https://doi.org/10.1088/1361-648x/ab0ef9	journal	April 2019
Electronic structure and optical properties of Sr ₂ IrO ₄ under epitaxial strain Bhandari, Churna; Popović, Zoran S.; Satpathy, S. New Journal of Physics, Vol. 21, Issue 1 https://doi.org/10.1088/1367-2630/aaff1b	journal	January 2019
Magnetic excitations in hole-doped Sr 2 IrO 4 : Comparison with electron-doped cuprates Clancy, J. P.; Gretarsson, H.; Upton, M. H. Physical Review B, Vol. 100, Issue 10 https://doi.org/10.1103/physrevb.100.104414	journal	September 2019
Formation of an incoherent metallic state in Rh-doped Sr 2 IrO 4 Louat, A.; Bert, F.; Serrier-Garcia, L. Physical Review B, Vol. 97, Issue 16 https://doi.org/10.1103/physrevb.97.161109	journal	April 2018
Enhanced insulating behavior in the Ir-vacant Sr ₂ Ir _{1– x} O ₄ system dominated by the local structure distortion Cheng, Jie; Dong, Peng; Li, Bin Journal of Synchrotron Radiation, Vol. 25, Issue 4 https://doi.org/10.1107/s1600577518005799	journal	May 2018
Electronic structure and optical properties of Sr$_2$IrO$_4$ under epitaxial strain Bhandari, Churna; Popović, Zoran S.; Satpathy, S. arXiv https://doi.org/10.48550/arxiv.1802.09719	text	January 2018

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